Wind tunnel experimental study on droplet drift reduction by a conical electrostatic nozzle for pesticide spraying

Zhang Wei, Hou Yongrui, Liu Xin, Lian Qi, Fu Xiaoming, Zhang Bo, Wang Haiyang, Wang Yingqian

Abstract


Abstract: Droplet drift wastes pesticide, pollutes the environment, and has become one of the focus issues of agricultural crop protection. Electrostatic spray technology reduces drift to a certain degree. In order to investigate the droplet drift pattern of a conical electrostatic nozzle, the droplet drift mass center distance was defined as an experimental index and used to conduct experimental wind tunnel studies on droplet drift. A mathematical model of the droplet drift mass center distance versus electrostatic voltage and wind speed was created via the regression method. The test results showed that the electrostatic voltage had an insignificant effect on droplet drift, the wind speed and its interaction with the electrostatic voltage had significant effects on droplet drift. When the wind speed was less than 3 m/s and stable, the crop adsorbability of a droplet had a dominant effect on the droplet drift; the droplet drift decreased with the increase of electrostatic voltage. When the wind speed exceeded 3 m/s and was stable, the reduced droplet particle size had a dominant effect on droplet drift, where droplet drift increased as the electrostatic voltage increased. When the wind speed was 0 m/s and the electrostatic voltage was 12 kV, the minimum droplet drift mass center distance was 35.5 mm, which was 56 mm less than that of conventional nozzle droplet drift. Therefore, a conical electrostatic nozzle is inapplicable for operation in an environment where wind speeds exceed 3 m/s. This study provides a reference for optimizing operational parameters of conical electrostatic nozzles and improving the anti-drift capability of droplets.
Keywords: pesticide spraying, conical electrostatic nozzle, droplet drift, wind tunnel, experimental study, electrostatic sprayer
DOI: 10.3965/j.ijabe.20171003.3074

Citation: Zhang W, Hou Y R, Liu X, Lian Q, Fu X M, Zhang B, et al. Wind tunnel experimental study on droplet drift reduction by a conical electrostatic nozzle for pesticide spraying. Int J Agric & Biol Eng, 2017; 10(3): 87–94.

Keywords


pesticide spraying, conical electrostatic nozzle, droplet drift, wind tunnel, experimental study, electrostatic sprayer

References


Otto S, Loddo D, Baldoin C. Spray drift reduction techniques for vineyards in fragmented landscapes. Journal of Environmental Management, 2015; 162(2): 290–298.

Pankaj G, Sirohi N P S, Mishra I M. Air flow characteristics of an air-assisted sprayer through horizontal crop canopy. Int J Agric & Biol Eng, 2012; 5(1): 1–6.

Qin W C, Xue X Y, Cui L F, Zhou Q Q, Xu Z F, Chang F L. Optimization and test for spraying parameters of cotton defoliant sprayer. Int J Agric & Biol Eng, 2016; 9(4): 63–72.

Gil E, Balsari P, Gallart M. Determination of drift potential of different flat fan nozzles on a boom sprayer using a test bench. Crop Protection, 2014; 56(2): 58–68.

Nigar Y B. Assessment of buffer zone for aquatic organisms in pesticide application. Int J Agric & Biol Eng, 2016; 9(5): 227–234.

Ding S M, Xue X Y, Lan Y B, Cai C, Zhang L, Zhang S C. Design and experiment of NJS-1 type open-circuit closed wind tunnel for plant protection. Transactions of the CSAE, 2015; 31(4): 76–84. (in Chinese)

Douzals J P, Al Heidary M. How spray characteristics and orientation may influence spray drift in a wind tunnel. International Advances in Pesticide Application, 2014; 122: 271–278.

Stainier C, Destain M F, Schiffers B. Droplet size spectra and drift effect of two phenmedipham formulations and four adjuvants mixtures. Crop Protection, 2006; 25(12): 1238–1243.

Qin K D, Tank H, Wilson S A, Downer b, Liu L. Controlling droplet size distribution using oil emulsions in agricultural sprays. Atomization and Sprays, 2010; 20(3): 227–239.

Fritz B K., Hoffmann W C, Lan Y. Evaluation of the EPA drift reduction technology (DRT) low-speed wind tunnel protocol. Journal of ASTM International, 2009; 6(4): 183–191.

Qiu W, Zhao S Q, Ding W M, Sun C D, Lu J, Li Y N, et al. Effects of fan speed on spray deposition and drift for targeting air-assisted sprayer in pear orchard. International Journal of Agricultural and Biological Engineering, 2016; 9(4): 53–62.

Hewitt A J, Maber J, Praat J P. Drift management using a GIS system. Proceedings of the Word Congress of Computer in Agriculture and Natural Resources, 2002; 290–296.

Salyani M, Cromwell R P. Spray drift from ground and aerial applications. Transactions of the ASABE, 1992; 35(4): 1113–1120.

Nuyttens D, De Schampheleire M, Baetens K. The influence of operator-controlled variables on spray drift from field crop sprayers. Transactions of the ASABE, 2007; 4: 1129–1140.

Ozkan E. New nozzles for spray drift reduction. Ohio State University Extension Fact Sheet, 2001.

Derksen R C, Ozkan H E, Fox R D. Droplet spectra and wind tunnel evaluation of venture and preorifice nozzles. Transactions of the ASABE, 1999; 42(6): 1573–1580.

Wang X N, He X K, Song J L, Herbst A. Effect of adjuvant types and concentration on spray drift potential of different nozzles. Transactions of the CSAE, 2015; 31(22): 49–55. (in Chinese)

Xue X Y, Tu K, Qin W C, Lan Y B, Zhang H H. Drift and deposition of ultra-low altitude and low volume application in paddy field. Int J Agric & Biol Eng, 2014; 7(4): 23–28.

Huang Y B, Thomson S J. Characterization of spray deposition and drift from a low drift nozzle for aerial application at different application altitudes. Int J Agric & Biol Eng, 2011; 4(4): 28–33.

Jiang P F, Mao H P, Li C, Chen F. Correlative analysis of spray parameters and droplet drift-based on air-assisted boom sprayer. Journal of Agricultural Mechanization Research, 2014; 4: 127–131. (in Chinese)

Dong X, Yang X J, Yan H R, Zhang T, Yan M D, Wang J. Three-dimensional simulation on drift-reduction of air-assist spraying. Journal of Agricultural Mechanization Research, 2012; 9: 44–48. (in Chinese)

Wang K Y. Theoretical analysis and applied research on air-assisted electrostatic spraying system. Shihezi University, 2006. (in Chinese)

Ru Y, Zhu C Y, Bao R. Spray srift model and its influencing factors analysis base on wind tunnel. Transactions of the CSAM, 2014; 45(10): 66–72. (in Chinese)

Ma C, Jia S X, Zhou Y. Experimental study on electrostatic nozzle spray cone angle. Journal of Agricultural Mechanization Research, 2014; 5: 188–190. (in Chinese)

He X K, Zeng A J, Liu Y J. Precision orchard sprayer based on automatically infrared target detecting and electrostatic spraying techniques. Int J Agric & Biol Eng, 2011; 4(1): 35–40.

Kirk I W, Hoffmann W C, Carlton J B. Aerial electrostatic spray system performance. Transactions of the ASABE, 2001; 44(5): 1089–1092.

Hu B. Study on the properties of corona plasma discharge atomization and design of sprayer heads. Chang'an Uinversity, 2008. (in Chinese)

Zhang L, Xue X Y, Sun Z, Zhang S C, Cai C. Electrostatic electrode optimization design and test on pressure-swirl nozzle. Journal of Chinese Agricultural Mechanization, 2014; 35(4): 128–131. (in Chinese)

Fu Z T, Qi L J. Wind tunnel spraying drift measurements. Transactions of the CSAE, 1999; 15(1): 115–118. (in Chinese)

Qi L J, Fu Z T, Gao Z J. Spray pattern and drift potential of a spinning disk. Journal of China Agricultural University, 2002; 7(2): 47–52. (in Chinese)

Yang Z, Niu M M, Li J, Xu X, Sun Z Q, Xue K P. Influence of lateral wind and electrostatic voltage on spray drift of electrostatic sprayer. Transactions of the CSAE, 2015; 31(24): 39–45. (in Chinese)

Li C, Zhang X H, Jiang J H, Jiang J H, Hu Y Y. Development and experiment of riser air-blowing sprayer in vineyard. Transactions of the CSAE, 2013; 29(4): 71–78. (in Chinese)

Hong W, Wu C Z. Experiment design and analysis-principles, operation and cases. China Forestry Publishing House, 2004. (in Chinese)

Jia W D, Xue F, Li C. Design of air assisted spray gun and experimental study on its spray performance. High Voltage Engineering, 2014; 40(7): 2197–2203. (in Chinese)


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